Feeder for stitching machines



Oct. 29, 1940. R. E. ACKLEY FEEDER FOR STITCHING MACHINES 10 Sheets-Sheet. 1

Filed April 29, 1939 Ifzvezz 07".-

OCL 29, 1940. R E ACKLEY 2,219,608

FEEDER FOR STITCHING MACHINES Filed April 29, 1939 10 Sheets-Sheet 2 Jal. 2.

Oct. 29, 1940. R. E. AcKLl-:Y 2,219,503

FEEDER FOR STITCHING MACHINES Filed April 29, 1939 10 Sheets-Sheet I5 Oct. 29, 1940. R, E ACKLEY y 2,219,608

FEEDER FOR STITCHING MACHINES Filed April 29, 1939 10 Sheets-Sheet 4 odi. 29, 1940. 'R E ACKLEY 2,219,608

FEEDER FOR STITCHING MACHINES Filed April 29, 1939 lyOSvheetS-Sheet 5 Oct. 29, 1940. R E, ACKLEY 2,219,608

FEEDER FOR STITCHING MACHINES Filed April 29, 1959 l0 Sheets-Sheet 6 Ct 29, 1940. R. E. AcKLEY FEEDER FOR STITCHING MACHINES Filed April 29, 1939 10 Sheets-Sheet 7 0a. 29, 1940. l R. E ACKLEY 2,219,608

FEEDER FOR STITCHING MACHINES Filed April 29, 19259 10 Sheets-Sheet 8 figg?.

Oct. 29, 1940.

R. E. ACKLEY FEEDER FOR STITCHING MACHINES Filed April 29. 1959 10 Sheets-Sheet 9 OCL 29, 1940 R. E. AcKLr-:Y 2,219,608

FEEDER FOR STITCHING'MACHINES Filed April 29, 1959 19 vsuns-shear 1o IIIIH Patented oct. 2.9, 1940 UNITED sTATEs PATENT l OFFICE- FEEDER FOR STITCHIN G MACHINES Raymond E. Acklcy, Chicago, lll.

`Application April 29, 1939, Serial No. 270,937 l 20 Claims.A (Cl. 27054 This invention relates to improvements in feeder for stitching machine and more especially such a feeder in combination with a saddle stitcher.

The saddle type of stitcher operating upon the folded signatures is well known in the art and need not be described or shown here. 'I'his type of stitcher embodies a long moving chain, for

conveying the gathered signatures to the stitching mechanism, overlying which are a series of saddles in fixed positions. Operators at each station place individual signatures, taken from a convenient pile, astride these saddles, with one ply hanging on each side of both'chain and saddle, and the folded edge resting on the apex of l5 the saddle. Suitable lugs or pushers on the chain engage the back margin of each signature so placed and push it off the end ofthe saddle, so that it drops a short distance to the top of the chain. The chain is placed a suiiicient distance below the saddles so that any signatures which are resting astride the chainl will pass below succeeding saddles. Thus theA signature furthest from the stitching mechanisml is dropped directly on the chain, the next signature over the first, and so on in succession until all the signatures are gathered in inset relation. A folded cover may then be dropped over the signature group, having been fed from a saddle in the same manner as the signatures. The

:m gathered book is then conveyed to the stitching mechanism,where it comes to rest momentarily to receive a staple or staples through the folded edges to secure the signatures of each group.

Heretofore it has been customary to place the 33 signatures on the saddle at each station by hand.

'I'his was referred to as hand gathering or feeding. That is, an operator sat at each station and took one signature at a time from the stack at that station, opened it. slightly, and placed 40 it over the saddle to be picked up by the pusher and then grouped with other signatures, and

the entire group carried to the stitching mechanism to receive the staples.

This invention comprises an automatic me-l pose of illustrating the invention, I have here v5U shown a single feeder operating in connection with a single stack of signatures toieed the same oneby one to the saddle of a saddle stitcher. It is to be`understood, however.' that'in regular use there may be one or more of such feeders,

.55 ordinarily more than one; onevfeederoperatirig in connection with each stack of signatures from which the saddle stitcher is supplied.

In speaking of a folded signature, it is to be understood also that I include a single sheet with one or more folds, and also one or more sheets with one or more folds. As a matter of fact, the single signature may comprise practically any arrangement or formation of paper including one or more sheets as long as such signature can hang over the saddle or ride astride 10 of the saddle with one ply hanging down on each side and one or more folded edges resting on the apex or top of the saddle. In this connection it is to be noted also that in the use ofthe term ply" I mean to include one or more thick- 15 nesses or sheets of paper. For example, if the signature comprises but one sheet with one fold, there will be but one single thickness ply on each side of the saddle. However, in the case of a single sheet with several folds orv in the case of 20 a. plurality of sheets, each ply of the signature may include a plurality of sheets or thicknesses.

I am using the term ply merely in a general sense to indicate that portion or portions of a signature hanging on one side of -the saddle in 25 contradist'inction to that portion or portions hanging on the opposite side of the saddle. Also, the'saddle stitcher may operate in commotion with but a single stack of signatures, for example, where each signature comprises one or more sheets having a plurality of folded edgesresting on the saddle'through which staples are to be inserted to hold the plurality of folded edges of the single signature together. In most cases, however, the stitcher will operate in conjunction 35 with a plurality of stacks of signatures to unite groups of signatures, each group containing a. signature from each stack.

By the use of my invention comprising an automatic mechanical feeder, the manual feeding by operators may be dispensed with, thereby increasing the speed and accuracy f the feeding and materially reducing labor costs.

The simplest form of signature may be visualized as a single sheet of paper with one-fold substantially at the middle; and I have here shown such a signature to illustrate the invention. Ordinarily, however, the fold is not excenter so :that one edge of one ply of the signa# ture' will overlap the other. For reasons to be hereinafter "explained, the-provision of 'an overlapping edge is utilized in the feeder I have shown.

Other features and advantages will appear more fully as I proceed with my specification.

In that form of device embodying the features of my invention, shown in the accompanying drawings-Fig. 1 is a view in end elevation; Fig. 2 is a view in side elevation; Fig. 3 is a view taken as indicated by the line 3 of Fig. 2; Fig. 4 is a view taken as indicated by the line l of Fig 2; Fig. 5 is a` view taken as indicated by the line 5 of Fig. 2, showing the mechanism at the time the signature is withdrawn from the supply hopper; Fig. 6 is a similar view showing the signature withdrawn to the extreme outward position; Fig. '1 is a fragmentary view similar to Fig. 6 showing the parts in a different position; Fig. 8 is a detail view showing the rack bar that operates the drum, taken as indicated by the line 8 of Fig. 9; Fig. 9 is a view taken as indicated by the line 9 of Fig. 4; Fig. 10 is a fragmentary view showing the clamp on the drum and the operating cam therefor, the parts being shown in the position just before the signature lap is engaged; Fig. 11 is a similar view with the lap partially engaged; Fig. 12 shows the same parts with the signature lap completely engaged; Fig. 13 is a. view taken as indicated by the line I3 of Fig. 10; Fig. 14 is a view taken as indicated by the line I4 of Fig. 10; Fig. 15 is a view taken as indicated by the line I5 of Fig. 16; Fig. 16 is a view taken as indicated by the line I6 of Fig. 15; and Fig. 17 is an enlarged sectional view of the clamp holding arm and clamp.

A general description preceding the detailed description will aid in understanding the construction and operation of the machine.

I0 indicates a stack of signatures with their folded edges lowermost. II indicates an oscillating segmental feeder drum, and I2 a. gripper thereon. I3, I3 are presser feet carrying the rollers I3a, i3d. I l indicates the saddle of the saddle stitcher. I5, I5 indicate clamps on the drum to clamp the overlapping edge of the signature. I6, I6 indicate fingers to support the folded edges of the stack of signatures. I1, I'I indicate suckers to pull down the folded edge of the bottom signature to free it from the supporting lingers I6.

In operation, the drum oscillates vthrough an are of about 310. One stroke may be referred to as the signature-withdrawing stroke, the gripper I2 gripping the folded edge of the bottom signature (previously separated from the stack by the suckers I1), withdrawing the signature from the stack and carrying it to a position above the saddle, as shown in Fig. 6. 'I'he return stroke may be referred to as the signature-delivering and positioning stroke, the drum during this movement first delivering the signature to the saddle (the beginning of this movement being shown inFig. '1) and then continuing its movement to a position to grip another signature.

During the movements mentioned, the parts are timed substantially as follows. Starting with the parts in the position shown in Fig. 5, the

gripper I2 on the drum II has gripped the folded edge Ilia of the bottom signature of the stack Il. This edge of the bottom signature has previously been separated from the rest of the stack and released from the supporting fingers I 6 by the y suckers II, which, through reduced air pressure, have attached themselves to the undersurface and then swung downwardly to pull down the nature-withdrawing stroke. -ment the gripper I2 holds the folded edge, and

viewed in this figure) through an arc of about 310, this movement being referred to as the sig- During this movethe rollers Ila of the presser feet are held adjacent the periphery of the drum to hold the signature against the drum. The guide arms Ilb work with the presser feet and assist in holding the signature adjacent the drum during the withdrawing stroke. The signatures are arranged in the stack so that when removed therefrom. the overlapping edge IIb of the signature will lie adjacent the drum. Shortly after this overlapping edge passes the rollers Ila on the presser feet, the clamps I5 clamp the overlapping edge of the signature. With the folded edge of the signature gripped by the gripper I2 and the overlapping edge clamped by the clamp I 5, the drum continues its signature-withdrawing stroke until it reaches the position shown in Fig. 6 with the signature in position above the saddle I l. 'I'he amount of movement of the drum after the clamps I5 close may be very little or even none depending on the width ofthe signature. From`this position it starts its return stroke, moving in a counterclockwise direction (as viewed in Figs. 5 and 6). Shortly after the commencement of this stroke the presser feet I3 with the rollers Ila and the members IIb are raised, as shown in Fig. '1, permitting the overlapped edge I0.c of the outer ply of the signature to be thrown outwardly by centrifugal force and by entry of air between the two plies. As vthis separation starts. the ply adjacent the drum is held against the drum by the clamps I5. As the return stroke of the drum continues, the outer ply will. therefore, come down on the outside of the saddle while the inner ply, being held next to the drum, will come down on the inside of the saddle. Just after the lower edge Illb of the inner ply is slightly below the top of the saddle, the clamps I5 release this edge IIb from the drum so that during the continued return stroke of the drum the separated plies of the signature will come down one on each side of the saddle Il, as shown in Fig. 7. After the folded edge of the signature is somewhat lower than the position shown in Fig. 'I so that the signature when released will drop on the saddle, the gripper I2 releases the folded edge, thus discharging the signature from'tne drum onto the saddle. From this point on. the drinn continues its return stroke to a position to grip another signature. During this completion of the return stroke the gripper I2 remains Vopen until the folded edge of the next signature, which has been separated from the stack by the suckers. enters between the gripper and the drum, whereupon the gripper closes to the position shown in Fig. 5 to grip the signature and start a new signature-withdrawing stroke as above described.

It will be seen from the above description that the complete cycle includes a signature-withdrawing stroke and a. return stroke, the vfirst portion of the return stroke delivering the signature to the saddle and the remaining portion positioning the drum for the commencement of another signature-withdrawing stroke.

A serious difficulty heretofore encountered in machines which open a signature by means of a lap which is gripped to hold one-half of the signature during the opening, is that it is difficult to insure either the exact position or the width of this lap.

Since the paper included in the lap is afterward trimmed off and wasted, the lap is always kept as narrow as possible. Folding mechanism, however, whether on a web press or on a special folding machine, does not operate with exact uniformity. 0n some signatures, the lap will be wider than other signatures; also the paper 1s frequent1y fanned ou to a greater or lesser extent, that is, the edges of some of the pages in Y the lap extend further than others. The signature itself may also vary in width, either be cause not folded on the proper line, orv in the case of signatures from web presses, because the amount of paper cut from the web at each revoy lution varies slightly. Finally, in feeding the signature to the opening mechanism, the posi- -tion of the lap with reference to the clamping means may vary somewhat.

It will be evident that the successful operation of mechanism for clamping a lap on a signature depends on several factors. 'I'he edge of the clamp must cover all of the pages on one-half of the signature, but none of the pages on the other half. To insure this the lamp must .be of such width that the clamp will not only hold the paper securely, but that allowance is made for all probable variations both in position. and width of the lap. 'I'his requires a comparatively wide lap and a considerable waste of paper.

In order to overcome this disadvantage, I provide a clamping means for the lap which does not operate in one xed position as heretofore, but is guided into its operating position by the edge of the signature itself. The lap may therefore vary considerably in position without affecting the operation of the clamp, and the latter need only be Wide enough to securely hold the paper. By this means I am able to operatev with a lap much narrower than has hitherto been considered necessary, with corresponding economy ofY paper. The action of the clamp in engaging the edge of the signature is shown in Figs. 1I), l1 and 12.

Having given a general description of the construction, timing, and function of the principal parts, I shall now give a more detailed description of the mechanism for operating the same.

The segmental drum has been referred to in general by the reference numeral II. As a matter of fact, this drum includes ythree sectorshaped portions (see Fig. 2) the center. one carrying the gripper I2 and the other two each carrying one of the clamps I5.

The ngers I6 supporting the folded edges of the stackof signatures also oscillate somewhat` to assist the suckers I1 in separating the folded edge of the bottom signature from the stack. In the position shown in Fig. 6, the ngers I6 are at the top of their oscillation and the suckers |1 are in position to attach themselves to the erating the chain 5I to drive the sprocket 62 on the main shaft 53.

The main shaft 53 carries a crank 54operating the rack bar 55 to oscillate the hollow'shaft 56 through the medium of the pinion 51 thereon. The hollow shaft 56 carries the drum segments II, II, II.

58 indicates a cam on the shaft' 53 operating the cam roller 59 on the bar 60 connected to the crank 6| on the rock shaft 62 carrying the members |3 and |3b.

63 indicates a cam on the shaft 53 operating the cam roller 64 on the bar 65 having its upper end pivoted to the crank 66 on the rock shaft 61 carrying the fingers I6. The rock shaft 61 is yieldingly held in one limit of its movement by the cam roller 1-3 on the arm I4 on the rock shaft 15 which operates through the arm 16, the link 11, and the arm 18 to rock the pipe 19 on the trunnions 80, 80. The pipe 19 carries the curved pipes 8|, upon the ends of which are mounted the suckers I1. l

82 indicates a cam on the shaft 53 operating through the cam roller 83 on the arm 84 on the shaft 85 to rock the arm 86 which in turn operates through the link 81 and arm 88 to rock the shaft 89 operating the valve to control the air suction on the suckers I1. This valve is shown in Fig. 15. 90 is a pipe leading to the pipe 19. 9| is the main suction line. The shaft 89 Vcarries the head 92 with the port 93 which connects the pipes 90 and 9| when suction is to be applied to the suckers land disconnects when the suction is to be released. Any suitable means may be provided for venting the pipe 90 when the suction is shut off. For example, the head 92 may be provided with a .port 94 connecting the line 90 with the vent 95 when the portA 93 is turned to cut oil the suction.

96 indicates a cylindrical cam on the shaft 53 operating the caml roller 91 on the rock arm 98 which operates the inner shaft 99 lying inside of the hollow shaft 56. The inner shaft 99 carries a short rack bar |00, the teeth of which engage teeth on the end of one arm |0I 'fof a bell crank pivoted at |02. The other arm |03 of the bell crank operates through the pin |04 against the arm |05 .carried by the gripper I2 to .raise the same against the pressure exerted by the spring is piv'oted by a pivot |2I-on the arm III, and isv held in position againstl the surface- IIIa by means of a light spring |22, but can be forced back to the position I5' by slightpressure. The arm III is itself carried on an adjustable pivot |09 mounted in the slot ||0 on the drinn. The outer end ofthe arm I carries a cam roller |I2 operatedby a loose cam I|3 onthe hollow shaft 56. The cam is provided with a slot |I4 embracing a stationary member |I5 so that slight rocking of the cam is permitted with respect to the member II5. Frictional engagement is provided between the shaft and cam, as shown in Fig. 14. Each cam ||3 is frictionally clamped between the two discs IIS and III on 'the shaft 56, the two discs being pulled together by springs H8 on the pins IIS. In operation the cam rollers II2 will move the cams H3 with them in each direction until movement of the cam is stopped by the member IIS, whereupon the rollers will ride over the cam surfaces to release the clamps I5. In other words, there is some lost motion between the cams and the shaft 56 so that in the withdrawing stroke of the drum the clamps I5 will 'engage the overlapping edge of the signature at a higher point than the point at which they release during the return stroke of the drum. As stated before, in the withdrawing stroke the clamps engage shortly after the lower edge of the signature passes the rollers I3a. In the delivering stroke, they release the lower edge at a lower point; that is, shortly after the edge is a little bit below the saddle. I2Il indicates a spring yieldingly holding the cam roller H2 against the cams H3.

fIo engage the signature lap, the arm I I I is first rocked back by the cam H3, as described, until the clamp I5 is positioned back of the edge I 0b of the signature, as shown in Fig. 10, The arm I I I is preferably so positioned in the slot I l0 that the shank portion I5c of the clamp makes contact with the overlapping edge IIIb of the signature before the lip I5d of the clamp engages, as shown in Fig. 11. During the final engaging motion of the clamp the shank I5c will yield under the tension of the spring |22 so that, in effect, the lip I5d will be guided vertically downwardly into engagement with the edge Ilib of the signature itself. Thus the nal relation of the clamp lip I5d to the edge I Bb of the signature will be as shown in Fig. 12, even though the posi-tion of the lap with respect to the drum may vary.

While there are shown and described certain embodiments ofthe invention, it is to be understood that it is capable of many modifications. Changes, therefore, in -the construction and arrangement may be made without departing from the spirit and scope of the invention as disclosed in the appended claims, in which it is intended to claim all novelty inherent in the invention as broadly as permissible, in view of the prior art.

What I claim as new, and desire to secure by Letters Patent, is:

1. Apparatus of the character described, including: a support for a stack of folded signatures; a saddle adjacent the support; means for separating the folded edge of a. bottom signature from a stack on the support; an oscillating drum; a gripper on the drum; and means for operating the gripper and drum to grip the folded edge of a bottom signature separated from the stack, withdraw it from the stack, and deposit it in opened condition astride the saddle.

2. Apparatus of the character described, including: a support for a stack of folded signatures; a saddle adjacent the support; means for separating the folded edge of a bottom signature from a. stack on the support; a drum; a gripper on the drum; means for operating the gripper and rotating the drum to grip the edge of a bottom signature sepa-rated from the stack, withdraw it from the stack, and move it to a position above the saddle; and means for rotating the drum in a reverse direction and releasing the gripper to deposit the signature in opened condition astride the saddle.

3. Apparatus of the character described, including: a support for a stack of folded signatures; a saddle adjacent the support; means for separating the folded edge of a bottom signature from a stack on the support; a drum: a gripper on the drum; means for rotating the drum in one direction through a withdrawing stroke, and operating the gripper thereon, to grip the edge of a bottom signature separated from the stack, withdraw it from the stack, and move it to a position above the saddle; and means for rotating the drum in a. reverse direction through a return stroke, and operating the gripper thereon, rst to release the signature and deposit it in opened condition astride the saddle, and then to return to position for the commencement of another withdrawing stroke.

4. Apparatus of the character described, including: a. support for a stack of folded signatures with the edge of one ply overlapping the other; a saddle adjacent the support; means for separating the folded edge of a bottom signature from a stack on the support; gripper on the drum; a clamp on the drum; means for operating the gripper to grip the folded edge of a bottom signature separated from the stack; means for rotating the drum in one direction through a withdra g stroke to withdraw the signature from the stack; means for operating the clamp during the withdrawing stroke to clamp the overlapping edge of one ply; and means for rotating the drum in a reverse direction through a return stroke and releasing rst the clamping means and then the gripping means, to deposit the signature on the saddle.

5. Apparatus of the character described, including: a support for a stack of folded signatures with the edge of one ply overlapping the other; a saddle adjacent the support; means for separating the folded edge of a bottom signature from a stack on the support; an oscillating drum; a gripper on the drum; a clamp on the drum; means for operating the gripper to grip the folded edge of a bottom signature separated from the stack; means for rotating the drum in one direction through a withdrawing stroke to withdraw the signature from the stack; means for operating the clamp during the withdrawing stroke to clamp the overlapping edge of one ply; and means for rotating -the drum in a reverse direction through a return stroke and releasing rst the clamping means and then the gripping means, to deposit the signature on the saddle, and continuing the return stroke to position the drum for the commencement of another withdrawing stroke.

6. Apparatus of the character described; including: a support for a stack of folded signatures with the edge of one ply overlapping the other; a saddle adjacent the support; means for separating the folded edge of a bottom signature from a stack on the support; an oscillating drum; a gripper on the drum; a clamp on the drum; means for operating the gripper to grip the folded edge of a bottom signature separated from the stack; means for rotating the drum in one direction through a withdrawing stroke to withdraw the signature from the stack and move it to a position above the saddle means for operating the clamp during the withdrawing stroke to clamp the overlapping edge of one ply; and means for rotating the drum in a reverse direction through a return stroke and releasing first the clamping means and then the gripping means, -to deposit the signature on the saddle.

7. Apparatus of the character described, including: a support for a stack of folded signatures with the edge of one ply overlapping the an oscillating drum; a n

from a stack on the support; a drum; a gripper other; a saddle adjacent the support; means for separating the folded edge of a bottom signature from a stack on the support; an oscillating drum; a gripper on the drum; a clamp on the drum; means for operating the gripper to grip the folded edge of a bottom signature separated from the stack; means for rotating the drum in one direction through a withdrawing stroke to withdraw the signature from the stack and move it to a position above the saddle; means for operating the clamp during the withdrawing stroke to clamp the overlapping edge of one ply; and means for rotating the drum in a reverse direction through a return stroke and releasing first the clamping means and then the gripping means, to deposit the signature on the saddle, and continuing the return stroke to position the drum for the commencement of another withdrawing stroke.

8. Apparatus as claimed in claim 2, with means for holding the signature adjacent the drum while being moved to a position above the saddle; and means for rendering said holding means inoperative during a portion of the rotation of the drum in a reverse direction.

9. Apparatus as claimed in claim 3, with means for holding the signature adjacent .the drum while being moved to a position above the saddle; and means for rendering saidholding means inoperative during a portion of the rotation ofthe drum through its return stroke. l

10. Apparatus as claimed in claim 4, with means for holding the signature' adjacent the drum during a portion of the withdrawing stroke; and means for rendering said holding means inoperative during a portion of the return stroke.

11. Apparatus as claimed in claim 5, 4with means for holding the signature adjacent the drum during a portion of the withdrawing stroke;

vand means for rendering said holding means inf operative during a portion of the return stroke.

12. Apparatus as claimed in claim 6, with means for holding the signature adjacent the drum during a portion of the withdrawing stroke; and means for rendering said holding means inoperative during'a portion of the return stroke.

13. Apparatus as claimed in claim '1,- with means for holding the signature adjacent the drum during a portion of the withdrawing stroke; and means for' rendering said holding means inoperative durlng a portion of the return stroke.

14. Apparatus as claimed in claim 4, in which the means for clamping the edge of the overlapping ply is operated by a cam relatively movable with respect to the drum.

15. Apparatus as claimed in claim 1. in which the drum is supported on a hollow shaft and in which the gripper is operated by a. rack bar in said shaft.

16. Apparatus of the character described, including: a support for a stack of folded signa, tures with the edge of one ply overlapping the other; a saddle adjacent the support; means for se the folded edge of a bottom signature on the drum; a clamp on the drum; means for operating the gripper to grip the folded edge of a bottom separated from the stack;

means to rotate the drum to position the signature above the saddle with the folded edge uppermost; means operative during the motion of the drum to operate the clamp to clamp the overlapping edge of the signature; and means to release the gripper and the clamp while the signature is positioned above the saddle and allow said signature to drop astride the saddle.

17. Apparatus of the character described, including: a support for a stack of folded signatures with the edge of one ply overlapping the other; a saddle adjacent the support; means for separating the folded edge of a bottom signature from a stack on the support; a drum; a gripper on the drum; a clamp on the drum; means for operating the gripper to grip the folded edge of a bottom signature separated from the stack; means to rotate the dr-um to position the signature above the saddle with the folded edge uppermost; means operative during the motion of the drum to first position the clamp against the overlapping edge of the signature and then clamp said edge; and means to release the gripper and the clamp while the signature is positioned above the saddle and allow said signature -to drop astride the saddle.

18. Apparatus of the character described, in cluding: a support for a stack of folded signatures with the edge of one ply overlapping the other; a saddle adjacent the support; means for separating the folded edge of a bottom signature from a stack on the support; a drum; a gripper on the drum; a yieldably mounted clamp on the drum; means for operating the gripper to grip the folded edge of a bottom signature separated from the stack; means to rotate the drum to position the signature above the saddle with the folded edge uppermost; means operative during the motion of the drum to cause the shank of said yieldably mounted clamp to first contact the overlapping edge of the signataire and thereafter guide the clamp into engagement with said edge; and means to release the gripper and the clamp while the signature is positioned above 'the saddle and allow said signatureto drop astride the saddle.

19. Apparatus of the character described, including: a drum adapted to support a signature with the edge of one ply overlapping the other;

a gripper on said drum adapted to grip the folded edge of a signature; a clamp on said drum adapted to clamp the overlapping edge of said signature; and means to nrst position the clamp against the overlapping edge of said signature and their clamp said edge.

20. Apparatus of the character described, in cluding: a drum adapted to support a. signature with the edge of one ply overlapping the other; a gripper on said drum adapted to grip the folded edge of a signature; a yieldably mounted clamp on the drum adapted to clamp the overlapping edge of said signature; and means to cause the shank of said yieldably mounted clamp to first contact the overlapping edge of Athe signature and thereafter guide the clamp into engagement with said edge.

l RAYMOND E. ACKLEY. 

